This Chapter was created during an age of insurrection, known as the Nova Terra Interregnum, sometime during the 35 th Millennium. The origins of the Murdering Sons harkens back to a great period of upheaval in the Imperium’s history. When crimes such as insurrection, rebellion or heresy require not only simply crushing the guilty, but to exact fierce retribution, the High Lords of Terra deploy the Murdering Sons. They quickly garnered a reputation as terror troops - habitually adorning their battle-plate with grisly adornments such as hanging bones and the applying of death mask symbols to their helmets, lending these Astartes a fearsome aspect. These grim warriors were well-suited for the task at hand, displaying a propensity for moral absolution and a drive to enact retribution. The first use of the Murdering Sons was to bring to heel those whom believed they could simply secede from the authority of the Imperium. Since the days of the Murdering Sons' inception, it has remained a Chapter apart from its fellow Adeptus Astartes, its origins shrouded in mystery, as it has garnered a fearsome reputation for its warriors' prowess as a shock-assault force as well as tireless pursuers and a peerless hunter-killer force. During this time, there were multiple foundings of Space Marine Chapters created to counteract the many outside threats to the unstable borders of the Imperium during this tumultuous period in Imperial history. This bellicose Chapter was created during the 11 th Founding sometime during the dark times of the Nova Terra Interregnum, a period of extreme unrest and civil strife, when the Imperium of Man was split in half, during the early-to-mid 35 th Millennium. The ' Homicidialis Filios' (more commonly known as the Murdering Sons in vulgar argot) are a darkly-famed Space Marine Chapter created with a specific purpose in mind - retribution. The time of judgement is at hand." - Murdering Sons multi-channel, world-wide vox-broadcast, at the outset of the Pacification of Mortikah V. Your fate has been writ by your own deeds. Your loyalty has been weighed, measured and found wanting. " Your offer to surrender has been received and rejected we have not come to restore order or receive supplication, but to enact the Divine Emperor's judgement.